[PATCH v3 1/6] PCI: dwc: Add msi_host_isr() callback

[Kunihiko Hayashi]

This adds msi_host_isr() callback function support to describe
SoC-dependent service triggered by MSI.

For example, when AER interrupt is triggered by MSI, the callback function
reads SoC-dependent registers and detects that the interrupt is from AER,
and invoke AER interrupts related to MSI.

Cc: Marc Zyngier <m...@kernel.org>
Cc: Jingoo Han <jingooh...@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunih...@socionext.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++----
 drivers/pci/controller/dwc/pcie-designware.h      | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c 
b/drivers/pci/controller/dwc/pcie-designware-host.c
index 0a4a5aa..9b628a2 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -112,13 +112,13 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 static void dw_chained_msi_isr(struct irq_desc *desc)
 {
        struct irq_chip *chip = irq_desc_get_chip(desc);
-       struct pcie_port *pp;
+       struct pcie_port *pp = irq_desc_get_handler_data(desc);
 
-       chained_irq_enter(chip, desc);
+       if (pp->ops->msi_host_isr)
+               pp->ops->msi_host_isr(pp);
 
-       pp = irq_desc_get_handler_data(desc);
+       chained_irq_enter(chip, desc);
        dw_handle_msi_irq(pp);
-
        chained_irq_exit(chip, desc);
 }
 
diff --git a/drivers/pci/controller/dwc/pcie-designware.h 
b/drivers/pci/controller/dwc/pcie-designware.h
index 656e00f..e741967 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -170,6 +170,7 @@ struct dw_pcie_host_ops {
        void (*scan_bus)(struct pcie_port *pp);
        void (*set_num_vectors)(struct pcie_port *pp);
        int (*msi_host_init)(struct pcie_port *pp);
+       void (*msi_host_isr)(struct pcie_port *pp);
 };
 
 struct pcie_port {
-- 
2.7.4